ACFT EQUIP PROB. NOSE GEAR DOOR HAD LOOSE SCREWS AND INTERFERED WITH OBTAINING A SAFE GEAR INDICATION FOR LNDG. RPTR HAD TIGHTENED SCREWS AND DEPARTED ONLY TO HAVE THE SAME PROB. RPTR RETURNED TO HOME BASE.

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DEPARTED TRK ENRTE TO TVL. AFTER DEP THE GEAR HANDLE FAILED TO RETURN TO THE NEUTRAL POS AND THE RED GEAR WARNING LIGHT STAYED ON (PA31-350). I TRIED TO RECYCLE THE GEAR AND GOT A NORMAL DOWN AND LOCKED INDICATION; 3 GREEN; HANDLE TO NEUTRAL; RED LIGHT OUT; AND THE NOSE GEAR WAS VISIBLE IN THE MIRROR ON THE L-HAND ENG NACELLE. I PUT THE HANDLE BACK INTO THE UP POS AND GOT ALL NORMAL INDICATIONS; 3 GREEN WENT OUT; I HEARD 3 'CLUNKS' OF THE WHEELS RAISING INTO THE WELLS; THE RED LIGHT STAYED ON. THE HANDLE FAILED TO RETURN TO NEUTRAL; THOUGH. BY THIS TIME IT WAS TIME TO START A DSCNT FOR LNDG SO I AGAIN LOWERED THE GEAR AND GOT A 3 GREEN NORMAL INDICATION. AFTER LNDG I GOT OUT TO VISUALLY INSPECT THE GEAR. I NOTICED 2 LOOSE SCREWS; ONE ON EACH NOSE GEAR DOOR. I RETIGHTENED THEM WITH MY FINGERS AND THOUGHT NOTHING MORE OF IT. I DEPARTED TVL ENRTE TO SMF AND HAD THE SAME PROB. I THEN PUT THE GEAR BACK DOWN AND DIVERTED TO MY HOME BASE; OAK; THE GEAR DOWN AND LOCKED. THE ACFT FLEW 3 LEGS PRIOR TO DEPARTING TVL WHERE IT SAT FOR ABOUT 5 HRS. ALL PRIOR LEGS WERE NORMAL AND WITHOUT INCIDENT. AT THE TIME I ASSUMED THE ACFT WAS LEGAL FOR FLT AND POSED NO SAFETY HAZARD TO ANYONE. LOOKING BACK NOW I MIGHT HAVE BEEN WRONG IN DEPARTING TVL.